power, as measured in watts.
the amount of power required to operate an electrical appliance or device.

1900–05; watt + -age

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World English Dictionary
wattage (ˈwɒtɪdʒ)
1.  power, esp electric power, measured in watts
2.  the power rating, measured in watts, of an electrical appliance

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
wattage   (wŏt'ĭj)  Pronunciation Key 
An amount of power, especially electrical power, expressed in watts or kilowatts.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The tunnels were silent and, lit by low-wattage bulbs, gloomy.
But the amount has not been stipulated: this is, apparently, where the
  commission will next focus its intellectual wattage.
So your input wattage per unit area is several times what the plants get.
The more wattage in the signal, the more power it has.
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